FR3132342A1 - AN IMPROVED TANK VENTING SOLENOID VALVE WITH LEAK PREVENTION FEATURE. - Google Patents

Abstract

The present invention provides an improved tank vent solenoid valve (1) with a leak prevention feature in which a plurality of threads are assembled with the nut (8) and the sealing profile (29) constructed on the OPR shaft (10) to prevent leaks, the plunger (22) has at least two inner cores (20, 21) press fitted inside the coil and plunger assembly (22) which act as a clearance fit to allow smooth movement of the plunger (22) when the tank solenoid is energized by moving due to a negative pneumatic force from the tank (1), the plunger (22) moves at the inside the adjusting screw (12) and assembles in the fixed core (18) to ensure that the axis of the fixed core (18) and the plunger (22) are the same without any frictional force acting in the radial direction.

Description

AN IMPROVED TANK VENT SOLENOID VALVE WITH LEAK PREVENTION FEATURE. FIELD OF THE INVENTION

The present invention relates to the field of solenoid valves. More particularly, the present invention relates to an improved tank vent solenoid valve with a leak prevention function which aims to define a sealing point for the Over Pressure Relief (OPR) and the pressure relief. overpressure (Over Pressure Relief - OVR) and to make the overpressure relief assembly (OPR) independent of the solenoid present in the solenoid valve.

BACKGROUND OF THE INVENTION

An evaporative emissions control system is required in hybrid vehicles to prevent fuel vapors from entering the atmosphere from the fuel tank and the entire fuel system. Fuel tank acts as a safe container for flammable liquids such as petroleum, diesel and fuel tanks are widely used in vehicles to store fuel, the stored fuel is propelled by a fuel pump or released by a pressurization method and also maintains the temperature of the stored fuel.

The evaporative emissions control system includes a tank vent valve which includes a solenoid controlled by an electrical control unit such as microprocessor control systems and which is responsible for the accumulation and recirculation of vapors from fuel in an engine. Generally, one side of the tank vent valve is matched with a carbon filter to allow fumes to enter the carbon filter, so that the emissions control system is pressurized and smoothly performs operations provided, and another side of the valve is connected to a vent pipe which includes one or more filters.

The tank vent valve is a solenoid valve usually closed and operated by a signal provided by the control unit and the tank vent valves currently available in the market are not effective in preventing leakage and emission of fumes, that is to say that the fumes stored in the tank are dangerous for human health.

The tank vent valve has complex components that increase the criticality of the valve during its manufacturing and assembly, which increases the overall cost of the tank vent valve. The presence of complex components in the tank vent valve leads to greater restriction in the flow path, and another disadvantage of the current tank vent valve is that there are alignment issues during switching operations (ON/OFF conditions), which makes the valve less efficient. The problem of tank vent valve wear also reduces the efficiency of the valve and hampers its performance.

US9732705B2 discloses a vapor purge system, which includes a fuel tank, a fuel tank isolation valve in fluid communication with the fuel tank, and a carbon filter in fluid communication with the tank isolation valve fuel. The vapor purge system also includes a tank vent valve in fluid communication with the carbon filter, an air filter in fluid communication with the tank vent valve. The disadvantages of this invention are the increased number of components in the tank vent valve, which increases the complexity of the assembly process and leads to an increase in cost. This invention does not provide an effective solution for leak prevention. This invention has no provision for maintaining alignment of the plunger shaft with the fixed core during the ON-OFF condition.

KR101468366B1 describes a vent valve assembly comprising a first housing element, a second housing element, a third housing element, a first valve and a second valve, wherein the first, second and third housing elements are configured to such that the second housing element, the first valve and the second valve are located between the first housing element and the third housing element. The disadvantages of this invention are that there is no way to prevent leaking hydrocarbons and other toxic materials from entering the atmosphere. Furthermore, the alignment problem is not solved by this invention.

Therefore, there is a need to improve the tank vent valve and provide an improved solenoid valve with a leak prevention function that provides for setting an over pressure relief (OPR) seal point and overpressure relief (OVR) and make the overpressure relief assembly (OPR) a self-regulated assembly from the solenoid present in the solenoid valve. Furthermore, there is a need for an improved solenoid valve with compact packaging and less wear.

OBJECT OF THE INVENTION

The main object of the present invention is to provide an improved tank vent valve with leak prevention function in a compact package, as well as over pressure relief (OPR) and over pressure relief (OVR) functions. .

Another object of the present invention is to provide an improved tank vent valve which sets a sealing point of over pressure relief (OPR) and over pressure relief (OVR) by increasing the spring load with a nut and an adjustable screw.

Another object of the present invention is to eliminate the overpressure relief (OPR) characteristics of the solenoid forces, i.e. in the present invention the overpressure relief (OPR) assembly is a body completely independent of the solenoid.

Another object of the present invention is to provide an improved tank vent valve which reduces the complexity of the valve during the manufacturing and assembly process.

Another object of the present invention is to provide an improved tank vent valve which provides improved flow due to reduced restrictions in the flow path.

Another object of the present invention is to provide an improved tank vent valve which maintains alignment of the plunger axis and the fixed core.

The present invention provides an improved tank vent valve with leak prevention function and compact packaging, as well as over pressure relief (OPR) and over pressure relief (OVR) functions that reduce complexity during the process assembly and maintain alignment of the plunger shaft and fixed core.

In one embodiment, the present invention provides an improved tank vent valve with a leak prevention feature including a housing assembly with a tank port, a nozzle with an atmospheric port, a spool, a spool cover , an O-ring, a fixed core, a plunger including at least two inner cores, a sealing disc, an overpressure relief (OPR) spring, an adjustment screw, an adjustment arrangement, an overpressure relief assembly which includes a joint support having a snap-lock profile, a plurality of slots and a plurality of tabs, an OPR shaft including a plurality of threads and a seal, a gasket, a joint support cap, a relief spring pressure relief (OPR), a cavity and an adjustment nut and at least two supports, one being an upper support and the other being a lower support, in which said plurality of threads is assembled with said adjustment nut and said sealing profile constructed on said OPR shaft to prevent leakage, said cavity in said sealing disc is provided to prevent anti-rotation of said over pressure relief (OPR) assembly, said locking profile for snap locking prevents leakage of said seal and said seal holder by snap-locking, said plurality of slots balances mass and prevents misalignment, said seal holder cap is laser welded with said seal holder to prevent external leakage of the OPR assembly, said seal holder cap has a seal assembled in said seal holder cap to eliminate the risk of leakage of the over pressure relief (OPR) shaft, said adjustment arrangement is provided to respond to leakage and overpressure relief flow (OVR), said overpressure relief spring (OVR) is installed between said adjustment screw and said plunger guided through said adjustment screw to prevent buckling, said overpressure relief spring (OPR) is installed between said seal support cap and said adjustment nut and guided through said guide profile, said plunger has at least two inner cores press-fitted within said spool assembly and said plunger which act as an adjustment of clearance to allow smooth movement of said plunger when the solenoid of said tank is energized by displacement due to a negative pneumatic force from the tank said plunger is guided inside by said adjustment screw and assembled in said fixed core for ensuring that the axis of said fixed core and said plunger are the same without any friction force acting in the radial direction and said improved tank vent valve has a thread adjustment provision which increases the spring load to prevent the escape.

In another embodiment, the present invention provides an improved tank vent valve with a leak prevention feature in the seal cap to eliminate the risk of leakage from the overpressure relief (OPR) shaft. The rubber seal is locked by a leak-proof profile. The seal holder cap is laser welded with the seal holder to prevent external leakage from the over pressure relief (OPR) assembly. A guide profile to guide the spring, a hole is provided inside the seal holder cap to guide the shaft. The joint holder cap includes at least three holes through which the fumes are eliminated from the orifice of the can towards the atmospheric orifice. The number of holes is decided solely by calculating the necessary flow surface, and therefore variable.

In another embodiment, the present invention is an improved tank vent valve with a leak prevention feature including an adjustment provision to respond to leaks and Over Vacuum Relief (OVR) flow. The set screw is assembled into the fixed core using the threads and the spring is installed between the set screw and the plunger with a guide in the set screw which eliminates the problem of buckling. The plunger moves inside the adjusting screw and is assembled in the fixed core, making the axis of the fixed core and the plunger are the same and there is no friction force acting in the radial direction, so the alignment of the plunger depends on the fixed core relative to the adjustment screw.

In another embodiment, the present invention provides an improved tank vent valve with a leak prevention feature in which the plunger includes an inner core which is press fit within the plunger and acts as a clearance fit so that the plunger moves smoothly when the solenoid is energized or moves due to negative pneumatic force from the tank. Another inner core is press-fit inside the spool and plunger assembly and serves as a clearance adjustment. The two inner cores help maintain alignment of the fixed core and plunger axis , which also eliminates wear. The fixed core has an O-ring pre-fitted into the coil assembly which allows fuel vapor to escape into the atmosphere.

The present invention relates to an improved tank vent valve with a leak prevention function that prevents the seal from dropping, over pressure relief assembly (OPR) anti-rotation, external leakage, eliminates the problem buckling and helps maintain alignment of the fixed core axis and plunger which also eliminates wear.

The above-mentioned objects and advantages of the present invention will become apparent from the brief description of the drawing, the detailed description of the invention and the appended claims hereinafter.

An understanding of the improved solenoid valve with a leak prevention feature of the present invention can be obtained by referring to the following drawing:

There shows a cross-sectional view of the overpressure relief (OPR) assembly in the initial state.

There shows a cutaway view of the overpressure relief (OPR) assembly in final condition.

There shows an exploded view of the overpressure relief (OPR) assembly in the solenoid valve enhanced with a leak prevention device according to an embodiment of the present invention.

There shows a perspective view of the overpressure relief (OPR) assembly according to one embodiment of the present invention.

There shows a perspective view of a guide profile with holes in the solenoid valve improved with a leak prevention device according to an embodiment of the present invention.

There shows another perspective view of the improved solenoid valve according to one embodiment of the present invention.

There shows an enlarged view of the improved solenoid valve according to an embodiment of the present invention.

There shows a diagram of the improved solenoid valve according to one embodiment of the present invention.

Fig. 9(a) and Fig. 9(b) respectively show a perspective view of a conventional vent valve and a perspective view of an improved vent valve.

Fig. 10(a) and Fig. 10(b) show perspective views of a joint holder with three and four holes respectively.

The present invention will now be described below with reference to the accompanying drawing in which a preferred embodiment of the invention is shown. This invention can, however, be realized in many different forms and should not be construed as being limited to the embodiment described herein. Rather, the embodiment is provided so that this disclosure is complete and fully conveys the scope of the invention to those skilled in the art.

Many aspects of the invention can be better understood with references to the drawing below. Components in the drawing are not necessarily drawn to scale. Rather, emphasis is placed on clearly illustrating the components of the present invention. Furthermore, similar reference numerals designate corresponding parts in different views of the drawing. Before explaining at least one embodiment of the invention, it should be understood that the embodiments of the invention are not limited in their application to the construction details and the arrangement of the components set out in the following description or illustrated in the drawing. Embodiments of the invention may be practiced and executed in a variety of ways. Furthermore, the phraseology and terminology employed herein are intended for description and should not be construed as limiting.

The present invention provides an improved tank vent solenoid valve with a leak prevention function that eliminates the possibility of seal drop, over pressure relief (OPR) assembly anti-rotation, peripheral leakage, buckling and helps maintain alignment of the fixed core axis and plunger which also eliminates wear.

According to a main embodiment, the present invention provides an improved tank vent solenoid valve with a leak prevention feature including a housing assembly with a tank port, a nozzle with an atmospheric port, a coil, a cover coil, an O-ring, a fixed core, a plunger including at least two inner cores, a sealing disc, an overpressure relief (OPR) spring, an adjustment screw, an adjustment arrangement, an overpressure relief assembly overpressure includes a seal support having a snap-lock profile, a plurality of slots and a plurality of tabs, an OPR shaft including a plurality of threads and a seal, a seal, a seal support cap, a relief spring pressure relief (OPR), a cavity and an adjustment nut and at least two supports, one being an upper support and the other being a lower support, in which said plurality of threads is assembled with said adjustment nut and said sealing profile constructed on said OPR shaft to prevent leakage, said cavity in said sealing disc is provided to prevent anti-rotation of said over pressure relief (OPR) assembly, said locking profile for snap locking prevents leakage of said seal and said seal holder by snap-locking, said plurality of slots balances mass and prevents misalignment, said seal holder cap is laser welded with said seal holder to prevent external leakage of the OPR assembly, said seal holder cap has a seal assembled in said seal holder cap to eliminate the risk of leakage of the overpressure relief (OPR) shaft, said adjustment arrangement is provided to respond to leakage and overpressure relief flow (OVR), said overpressure relief spring (OVR) is installed between said adjustment screw and said plunger guided through said adjustment screw to prevent buckling, said overpressure relief spring (OPR) is installed between said seal support cap and said adjustment nut and guided through said guide profile, said plunger has at least two inner cores press-fitted within said spool assembly and said plunger which act as an adjustment of clearance to allow smooth movement of said plunger when the solenoid of said tank is energized by displacement due to negative pneumatic force from the tank, said plunger is guided inside by said adjusting screw and assembled into said fixed core to ensure that the axis of said fixed core and said plunger are the same without any friction force acting in the radial direction and said improved box vent solenoid valve has an adjustment arrangement of a thread which increases spring load to prevent leakage.

According to another embodiment, the present invention provides an improved tank vent solenoid valve with a leak prevention function with the adjustment screw, which is guided to eliminate the buckling problem by an overpressure relief spring (OVR ) which is installed between the adjusting screw and the plunger and the adjusting screw is assembled in said fixed core by a plurality of threads. The seal is locked by a burglar-proof profile. The cavity is provided to prevent anti-rotation of the overpressure relief (OPR) assembly. The seal holder cap is designed to eliminate the risk of leakage from the OPR shaft of the improved box vent solenoid valve through the incorporation of a leak prevention device. The spring is guided by a guide profile and a hole is provided inside said seal-holder cap to guide the shaft. The seal cap has at least three holes that vent fumes from the can port to the atmospheric port nozzle. The plunger is aligned via said fixed core with respect to said adjustment screw. The plunger is aligned across the axis of at least two internal cores and said plunger eliminates wear and tear and said fixed core has an O-ring before being pre-mounted in said spool assembly to allow exhaust of fuel vapors into the atmosphere. The over pressure relief (OPR) assembly includes a seal and said seal support, the over pressure relief (OPR) shaft and said seal support cap are made of a material that includes, but is not limited to, a semi-synthetic or synthetic material such as plastic by injection molding.

Referring to the and to the , in one embodiment, two cross-sectional views of the overpressure relief (OPR) assembly (11) in an initial and final state are shown respectively. The improved tank vent solenoid valve (1) with a leak prevention feature comprises a housing assembly (23) with a tank port, a coil (19), at least two brackets (24), a cover coil (25), a ring (26), a nozzle with an atmospheric orifice (27), a fixed core (18), a plunger (22), a sealing disk (28), an overpressure relief assembly ( OPR) (11). The over pressure relief (OPR) assembly includes a seal support (5), an over pressure relief (OPR) shaft (10), a seal (7), a seal support cap (6), a spring overpressure relief (OPR) shaft (9) and an adjusting nut (8), the overpressure relief (OPR) shaft (10) has a plurality of threads that fit together with the adjusting nut (8) and a snap-lock profile (29) is made on the joint support (5) to prevent leakage.

Referring to the , an exploded version of the Over Pressure Relief (OPR) assembly (11) is shown. The seal holder (5) has a locking profile (14) for snap locking which prevents leakage of the seal (4) and the seal holder (5). The threads on the OPR shaft (10) and adjusting nut (8) also allow the spring load to be adjusted. The seal support (5), the overpressure relief (OPR) shaft (10) and the seal support cap (6) are made of a material that includes, but is not limited to, a semi-synthetic material or synthetic such as plastic, by injection molding. A seal (13) is assembled in the seal cap (6) to eliminate the risk of leakage of the overpressure relief (OPR) shaft (10), in which the seal (13) is locked with a burglar-proof profile. The overpressure spring (9) is included in the overpressure relief (OPR) assembly.

There shows another cutaway view of the overpressure relief (OPR) assembly in the upgraded tank vent solenoid valve with a leak prevention feature. The seal (4) is locked by pressure on the sealing profile (29) which prevents the seal (4) from falling. The seal support (5) includes several slots (2) to balance the mass and prevent misalignment, several tabs (3) to insert the sealing disc (28), a cavity is provided to prevent rotation of the assembly overpressure relief (OPR) (11). A ball joint mechanism is present in the joint holder (5). The seal support cap (6) is laser welded with the seal support (5) to prevent external leakage from the over pressure relief (OPR) assembly (11).

In reference to the , a perspective view of the guide profile with holes in the improved solenoid valve with leak prevention function is shown. A guide profile (15) for guiding the overpressure relief (OPR) spring (9), a hole (16) is provided inside the guide profile (15) for guiding the overpressure relief shaft ( OPR) (10). The seal-holder cap (6) comprises at least three holes through which the fumes are eliminated from the orifice of the can towards the atmospheric orifice. The dimensions of the holes (16) may vary depending on the calculation of the flow area. In the assembly process, it is easy to assemble the over pressure relief (OPR) assembly (11) and adjust the leaks at the actual points as needed.

Referring to the , another perspective view of the improved solenoid valve is shown in which an adjustment arrangement is provided to respond to leakage and flow rate of the pressure relief valve (OVR). The adjustment screw is assembled in the fixed core using threads and the overpressure relief (OVR) spring (17) is installed between the adjustment screw (12) and the plunger (22) with a guide in the adjusting screw (12) which eliminates the buckling problem. After the completion of the assembly process or after the laser welding process, adjustments of leakage and flow specifications are made by the adjustment screw from the bottom side of the over pressure relief (OPR) assembly. The adjustment screw (12) is made of brass, copper, plastic and other non-magnetic materials. The plunger (22) is guided inside by said adjusting screw (12) and is assembled in the fixed core (18), whereby the axis of the fixed core (18) and the plunger (22) is the same and there is no friction force acting in the radial direction, therefore the alignment of the plunger (22) depends on the adjustment screw (12).

Referring to the and to the , an enlarged view of the improved tank venting solenoid valve and a schematic of the improved solenoid valve are respectively shown in which the plunger (22) includes an inner core (21) which is press-fitted within the plunger (22) and acts as a clearance fit so that the plunger (22) moves smoothly when the solenoid is energized or moves due to negative pneumatic force from the box. Another inner core (20) is press fit within the spool (19) and plunger assembly and acts as a clearance fit. The two inner cores (20, 21) help maintain the alignment of the axis of the fixed core (18) and the plunger (22), which also eliminates wear. The fixed core (18) has an O-ring pre-mounted in the coil (19) which prevents fuel vapor from escaping into the atmosphere. The plunger (22) is guided in the spool (19) by the inner core (20) which is press-fitted into the spool (19), so that the spindle of the spool (19) and the plunger (22) ) remain guided, as opposed to the conventional plunger guided directly in the coil. When the fuel fumes/vapors need to pass from the tank to the atmospheric port, the engine control unit provides a signal to the solenoid, the overpressure relief (OPR) assembly moves downward with the plunger (22 ). The overpressure relief (OPR) assembly (11) and the plunger (22) are ball jointed, which allows the plunger (22) to move freely in the axial direction. The spool cover (25) and a ring (26) are part of the housing assembly (23). The fuel fumes/vapors pass from the tank port to the atmospheric port after sending the signal from the engine control unit to the enhanced solenoid valve (1). When the enhanced solenoid valve (1) is in the closed position and the pressure increases in the tank, the overpressure relief (OPR) shaft (10) moves downward due to the pneumatic force and fumes /fuel vapors pass from the tank side to the atmospheric side.

Referring to Fig. 9(a) and Fig. 9(b), we can see a perspective view of a conventional vent valve (1') and a perspective view of an improved tank vent solenoid valve (1). In Fig. 9(a) and Fig. 9(b), it is observed that the restriction in the flow path is greatly reduced in the present invention and the reduction of this restriction provides a clear path for the flow of fluid, resulting in increased flow. The exterior structure of the improved solenoid valve (1) with the box and the atmospheric port are combined into a small assembly with 180° orientations. The orientation of these ports can be changed by an in-line port in the same direction or by 90° orientations as required. The improved tank vent solenoid valve (1) is initially closed and no fuel smoke/vapour passes through the tank to the atmospheric port and no flow is present from the atmospheric port to the tank under ideal vehicle conditions.

When there is an increase in the area of a cross section, the flow rate increases. Fig. 10(a) and Fig. 10(b) shows the seal holder (5), one with three holes (see Fig. 10(a)) and the other with four holes (see Fig. 10(b)) respectively. The total flow area in both supports is the same as when the number of holes is increased and the thickness of the rib is decreased. In the above scenario, the flow rate remains the same regardless of the number of holes because the flow area is the same.

Therefore, the present invention provides an improved and cost-effective tank vent solenoid valve with leak prevention function with over pressure relief (OPR) and vacuum relief (OVR) functions and can adjust the point of release. sealing over pressure relief (OPR) and vacuum relief (OVR) by increasing the spring load with an adjustable nut and screw, eliminate over pressure relief (OPR) functions of the solenoid forces that make independent overpressure relief (OPR) assembly, improve internal flow, maintain plunger axis alignment and secure the core.

Many of the modifications and other embodiments of the invention set forth herein will be readily apparent to one skilled in the art to which the invention relates, having the benefit of the teachings presented in the foregoing descriptions and the associated drawing. Therefore, it is to be understood that the invention is not to be limited to the specific embodiments disclosed and that modifications and other embodiments are intended to be included within the scope of the appended claims. Although specific terms are used herein, they are used only in a generic and descriptive sense and not for the purpose of limitation.

The foregoing description of embodiments of the invention has been presented for purposes of illustration and description. It is not intended to be exhaustive or to limit the invention to the precise form disclosed, and modifications and variations are possible in light of the above teachings or may be acquired through practice of the invention. The embodiments have been chosen and described in order to explain the principles of the invention and its practical application to enable a person skilled in the art to use the invention in various embodiments and with various modifications adapted to the use particular considered.

Claims (10)

Improved tank vent solenoid valve (1) with a leak prevention feature including:
a housing assembly (23) with a tank port; a nozzle with an atmospheric orifice (27);
a coil (19);
a spool cover (25); an O-ring (26); a fixed core (18);
a plunger (22) comprising at least two inner cores (20, 21);
a sealing disc (28);
an overpressure relief spring, Over Vacuum Relief - OVR, (17); an adjustment screw (12);
an adjustment provision;
an Over Pressure Relief (OPR) assembly (11) which includes a joint support (5) having a snap-lock profile (29), a plurality of slots (2) and a plurality of legs (3 ), an OPR shaft (10) comprising a plurality of threads and a seal, a seal (4), a seal support cap (6), an Over Pressure Relief – OPR spring, ( 9), an adjustment nut (8), a cavity; And
at least two supports (24), one being an upper support and the other a lower support;
in which :
said plurality of threads are assembled with said adjusting nut (8) and said sealing profile (29) constructed on said OPR shaft (10) to prevent leakage;
said cavity in said sealing disc (28) is provided to prevent anti-rotation of said OPR overpressure relief assembly (11);
said locking profile (14) for snap-locking prevents leakage of said seal (4) and said seal support (5) by snap-locking;
said plurality of slots (2) balances the mass and prevents misalignment;
said joint support cap (6) is laser welded with said joint support (5)
to prevent external leakage of the OPR assembly (11);
said seal support cap (6) has a seal (13) assembled in said seal support cap (6) to eliminate the risk of leakage of the OPR overpressure relief shaft (10);
said adjustment arrangement is provided to respond to the leakage and flow rate of the OVR pressure relief valve;
said OVR overpressure relief spring (17) is installed between said adjustment screw
and said plunger (22) guided through said set screw (12) to prevent buckling;
said OPR overpressure relief spring (9) is installed between said joint support cap (6) and said adjusting nut (8) and guided through said guide profile (15);
said plunger (22) has at least two inner cores (20, 21) press mounted within said spool assembly and said plunger (22) which act as a clearance fit to permit smooth movement of said plunger (22) 22) when the solenoid of said tank is excited by a movement due to a negative pneumatic force coming from the box (1);
said plunger (22) is guided internally through said adjusting screw (12) and assembled into said fixed core (18) to ensure that the axis of said fixed core (18) and said plunger (22) is the same without any friction force acting in the radial direction; And
said improved tank vent solenoid valve (1) has a thread adjuster which increases the spring load to prevent leakage. An improved tank vent solenoid valve (1) with a leak prevention function according to claim 1, wherein said adjusting screw (12) is guided to eliminate the problem of buckling by an OVR overpressure relief spring (17). which is installed between the adjustment screw (12) and the plunger (22) and the adjustment screw (12) is assembled in said fixed core (18) by a plurality of threads. An improved tank vent solenoid valve (1) with leak prevention feature according to claim 1, wherein said seal (13) is interlocked with an anti-draft profile. An improved tank vent solenoid valve (1) with a leak prevention feature according to claim 1, wherein said cavity is provided in said sealing disc to prevent anti-rotation of the OPR overpressure relief assembly (11). An improved tank vent solenoid valve (1) with leak prevention feature according to claim 1, wherein said seal support cap (6) is provided to eliminate the risk of leakage from said OPR shaft (10) of said improved tank vent solenoid valve (1) by incorporating a leak prevention feature. An improved tank vent solenoid valve (1) with a leak prevention feature according to claim 1, wherein said spring (9) is guided through a guide profile (15) and a hole (16) is provided therein. inside said joint support cap (6) to guide the shaft (10). An improved tank vent solenoid valve (1) with a leak prevention function according to claim 1, wherein said seal support cap (6) includes at least three holes which remove fumes from the tank port to said atmospheric port nozzle (27). An improved tank vent solenoid valve (1) with a leak prevention feature according to claim 1, wherein said plunger (22) is aligned through said fixed core (18) with respect to said set screw (12). An improved tank vent solenoid valve (1) with a leak prevention feature according to claim 1, wherein said plunger (22) is axially aligned with at least two inner cores (20, 21) and said plunger ( 22) eliminates wear and tear and said fixed core (18) has an O-ring (26) before pre-assembly into said coil assembly to allow escape of fuel vapor to the atmosphere. An improved tank vent solenoid valve (1) with a leak prevention feature according to claim 1, wherein said OPR overpressure relief assembly comprises a seal (7) and said seal support (5), the shaft of over pressure relief (OPR) (10) and said seal support cap (6) is made of a material which includes, but is not limited to, a semi-synthetic or synthetic material such as plastic by injection molding .